Changing bending rolls in sheet-glass-drawing machines



J. Mv. NEEN/iN GHANGIN SEHPING ROLLS 1N SHEET GLASS DRAWING MACHINES Filed Feb. 23, 1924 Pntentec Mar. 10, 1925.

UNITED STATES 1,529,265@ PATENT' oFFacE.

JGSEH M RENAN, 0F SHBEVEPORT, LOUISIANA, ASSIGNOR '1.0 THE LIBBEYOWENS SHEET GLASS COMPANY. 0F TOLEDQ OHIO, A CORYORATION 0F OHIO.

CHANGING BBNDING RQLLS IN SHEET-GLASS-DBAWING MACHINES Ayplicaor. med february 23v i924.

St't'ial No. 694,524.

The auxiliary roll 21, which is preferably considerably smaller than the main bending roll 4, may be provided with a polished sheet-supporting surface, although it is not essential that this roll surface be as perfect as those of the rolls 4 and 5, since the roll 21 is only used for a short time while the changing operation is taking place, and the glass drawn thereover will ordinarily be discarded.

A Windlass mechanism .24 is provided to simultaneously move the bearing-boxes 20 up and down the guides. This windlass comprises a horizontal cross-shaft 25 earrying a cable drum 26 at either end. Shaft 25 is adapted to be rotated by a suitable crank 27 at one end and the reverse movement of the shaft is controlled by the pawl QR engaging ratchet 29. At each side of the machine a cable 30 passes down around deflecting roller 31 carried by the projecting arm 3Q of guide-bar 15, and the lower end of the cable is adapted to be hooked onto the eye 33 projecting from the lower Side of bearing-box :20, ily suitably turning the crank 27 the bearing-boxes Q0 at the two sidr of the machine may be simultaneously dr. n up along the guides 17. carrying with them the horizontal auxiliary roller 21. The roller may 'be held in place at any desired elevation or position by the pawl and ratchet 28 and 29, and when it is desired to lower the auxiliary roller, paw] 2S will be removed from the ratchet and the roller lowered by a reverse movement of crunk 27.

Then it becomes` necessary to changithe bendingr roller in one of these sheet-drawing machines. the new bending roller 1 :ind theI auxiliary roll 21 will rst be heated (in any suitable manner) to a temperature such that they may be placed in the machine without .unduly chilling the glass sheet. The guides '15 are then bolted in place at the sides of the machine, and the windlass mechanism 24 is clamped in position on top of the machine. The bearing-boxes 2O :irc then placed on the ends of the auxiliary roll 21` which is still outside of the machine, and the roll is lifted and supported by a long rod or tool 34 having a reduced end 35 which may be inserted in one end of the hollow roll 21. Only one end of this tool 34 is shown in Fig. 9.. The tool 34 is suspended from an overhead crane 'by the cable or chain 36, and then the auxiliary roll 21 if: pushed into position below the bending roll 4. and the boxes .10 are fastened in place upon the guides 17. If desired, the procedure just outlined may be changed by first securing the bearing-box 20, on the far side of the machine, in place on the guide 17, and then slipping the end ot' roll 211 into this bearing when the roll is placed under the bending roll 4 as iust described. A fter the bearing-boxes 2O have been positioned upon tlii goi les 17 the lower ends of the cablesI im ,vi-o bombed to thc 4510s :i3 S0 ab 'LO Elipport the auxiliar) roll in this` initial position.. hit-h is ibut .shown in full lines ill l"i -1 l oil lla drawings. :intl indicated by the li'iiii' The crank i'T is non' rotated until the roller f 'l is' dlnvrn up to the pOsitiOn P (indiffltCCl in dotted lines) \\'lni`c tbi:.` rollt-fl' i inst lnounh! into contact with the nodmail rcrtiuil run ol' .the glass sheet 1. I'The idler roll Y and bending roll 4 :ire now moved i\' l' iii lln lvl-i'. liig'. l. l sllltfllily )Manipulating the bolts 1l and 12. Auxiliary roll Q1 is nou dran-n up to the position C, in which position the ghisa' bllt l iS entirely supported .u the bending point by this aux ili::ry roller and bending roll 1 is out of contact with the sheet. The old bending roll i may be removed and the new one inserted in its placeA 'While tliiS Change is being made the glass sheet 1 is wntinuously beingdrawn over the auxiliary roll 21..

A iter the change has been made` auxilio ry roll .21 is first lowered to the position B, and then rollsl 4 and are moved to the right to their normal positions. nvriliary roll 21 is then completely lowered to its initial position A, after which the auxiliary roll 21 :ind its supporting and adjusting members ani removed by a reversal of the steps first described,

This complete operation takes but a. very short time and the glass sheet is supported for :in even shorter time upon the auxiliary IUll Q1. The iunpnlttiveli Slioli Strip Of glass which is distrirmted by thcee operations and which passes over the roll QI will nennlly be of inferior quality, and will be discarded. However, this possible loss is very slight compared with the large amount of production that is lost by the old method of roll changing hereby the sheet-drawing, operation must cease entirely for a considerH able time.

Claims:

1. In the procese of drawing a continuous sheet of glass from a pool of molten glass and then bending the plastic sheet about a bending 'roller into method of changing bending rollers without. halting the drawing operation. consisting in positioning an auxiliary roller `within the angle made by the sheetA but out of contact with the sheet, then moving the auxiliary roller into the angle of the sheet so as to support the sheet and lift same from the bending roller. removing and replacing the. bending roller. sind then moving the auxiliary roller out of the sheet angle so that the sheet will be supported by the nevi7 bending IOlle.

2. In the process of drawing a continuous sheet of glass from a pool of molten glass and then bending the plastic sheet about a another plane.. the

bending mler Ent anoher pmnsl` the metlmd mi' changing lwming; roller-s withou, halting Hw drawing; npfwaon, Qm'xssng in positioning an, auilmy rolia' vthu the, angle made by the Shet but. out of Contact with the Shee, hin moving hv auxiliary roler into the :mgf of the sheet so m Support the heev and it; same from thv bending: miki:wmm'ing and mplmng w bending roff" md Hwn m4n/'ing Hw zmxi* 3. An apparzxtlus ihr changing lwmngj rokz in machine for drawing :1 mnnuons shee, of gznss und lcectng the plstc Sheet. about bending toller, comprising an auxiliary @has supporting l'oHezp, and means for' positioning the auxiliary roler wihin Hw angle, si the sheet so as to Support the sheet out 0f ctmxacy with the bending mlmz 4;, An appmnus for c-'xangng Eje-ndng fuler in machina 01" rawng a Cantin-- nous sheet, of and dae-sting: the pnst'lc Shet afnam, a1 monding ioe'r, comprngz am auxiafry SI'mat-suppm'ting roller, and a pail' m" grudefa along whv the :mxlafry mler mowd from inactive pastion t0 a p0si tam where it suppors ihe gass sheet out of Contact with the bending toilet.

An apparatus 'for changing bending rollers in a, mac-Mn@ for drawing a contnuous sheet of 1,1255 and (ecci'ng the plast@ sheet amu a herding roller, wmprsing am :mxiismy sheebuppoytng mii/er, a

^ shew; Ming; simultuneousy 

